Disclosure Of Sustainability-Related Financial Information
| Concept | 
                                    
                                        2023-04-01 to 2024-03-31  | 
                            
                                
                                    
                                        2022-04-01 to 2023-03-31  | 
                            
                                
                                    
                                        2021-04-01 to 2022-03-31  | 
                            
                                
                                    
                                        2020-04-01 to 2021-03-31  | 
                            
                        
|---|---|---|---|---|
| Disclosure of Sustainability-related Financial Information | ||||
| Scope 1 and 2 greenhouse gas emissions | ||||
| Gross scope 1 and 2 greenhouse gas emissions | 
                                        
                                             
                                                5,866
                                                
                                                    
                                                        utr:tCO2e
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6,612
                                                
                                                    
                                                        utr:tCO2e
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6,720
                                                
                                                    
                                                        utr:tCO2e
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                6,950
                                                
                                                    
                                                        utr:tCO2e
                                                    
                                                
                                             
                                        
                                     |